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    • 54. 发明授权
    • VCM driver and PWM amplifier
    • VCM驱动器和PWM放大器
    • US07848044B2
    • 2010-12-07
    • US12728449
    • 2010-03-22
    • Yasuhiko KokamiHiroshi Kuroiwa
    • Yasuhiko KokamiHiroshi Kuroiwa
    • G11B5/02G11B21/02
    • G11B5/5526G11B5/5547
    • The present invention provides a VCM driver realizing low power consumption and high accuracy and a PWM amplifier compensating a dead time distortion. A phase compensator, a ΔΣ modulator receiving an output signal of the phase compensator and converting the output signal to a control code of predetermined bits, a PWM modulator receiving the control code to produce a PWM signal, and an output circuit receiving the PWM signal to drive a voice coil constitute a forward path. A sense amplifier sensing a current of the voice coil, an ADC receiving an output signal of the sense amplifier, a low-pass filter receiving an output signal of the ADC, and a decimation filter receiving an output signal of the low-pass filter constitute a feedback path. An output signal of the decimation filter is fed back to the input side of the phase compensator to form a major feedback loop having a first-order characteristic loop gain. An output signal of the decimation filter is fed back to the output side of the phase compensator to form a minor feedback loop having a loop gain which is flat until a target band frequency when viewed from the output side of the phase compensator.
    • 本发明提供了实现低功耗和高精度的VCM驱动器以及补偿死区时间失真的PWM放大器。 相位补偿器,&Dgr;&Sgr; 调制器接收相位补偿器的输出信号并将输出信号转换成预定位的控制码;接收控制码以产生PWM信号的PWM调制器;接收PWM信号以驱动音圈的输出电路构成一个 前进路径 感测放大器,感测音圈的电流,接收读出放大器的输出信号的ADC,接收ADC的输出信号的低通滤波器以及接收低通滤波器的输出信号的抽取滤波器构成 反馈路径。 抽取滤波器的输出信号被反馈到相位补偿器的输入侧以形成具有一阶特性环路增益的主反馈环路。 抽取滤波器的输出信号被反馈到相位补偿器的输出侧,以形成从相位补偿器的输出侧观察到直到目标频带频率为止的环路增益的次级反馈环路。
    • 56. 发明申请
    • VCM DRIVER AND PWM AMPLIFIER
    • VCM驱动器和PWM放大器
    • US20090080115A1
    • 2009-03-26
    • US12169891
    • 2008-07-09
    • Yasuhiko KokamiHiroshi Kuroiwa
    • Yasuhiko KokamiHiroshi Kuroiwa
    • G11B5/54
    • G11B5/5526G11B5/5547
    • The present invention provides a VCM driver realizing low power consumption and high accuracy and a PWM amplifier compensating a dead time distortion. A phase compensator, a ΔS modulator receiving an output signal of the phase compensator and converting the output signal to a control code of predetermined bits, a PWM modulator receiving the control code to produce a PWM signal, and an output circuit receiving the PWM signal to drive a voice coil constitute a forward path. A sense amplifier sensing a current of the voice coil, an ADC receiving an output signal of the sense amplifier, a low-pass filter receiving an output signal of the ADC, and a decimation filter receiving an output signal of the low-pass filter constitute a feedback path. An output signal of the decimation filter is fed back to the input side of the phase compensator to form a major feedback loop having a first-order characteristic loop gain. An output signal of the decimation filter is fed back to the output side of the phase compensator to form a minor feedback loop having a loop gain which is flat until a target band frequency when viewed from the output side of the phase compensator.
    • 本发明提供了实现低功耗和高精度的VCM驱动器以及补偿死区时间失真的PWM放大器。 相位补偿器,DeltaS调制器,接收相位补偿器的输出信号,并将输出信号转换成预定位的控制码; PWM调制器,接收控制码以产生PWM信号,以及输出电路,接收PWM信号 驱动音圈构成前进路径。 感测放大器,感测音圈的电流,接收读出放大器的输出信号的ADC,接收ADC的输出信号的低通滤波器以及接收低通滤波器的输出信号的抽取滤波器构成 反馈路径。 抽取滤波器的输出信号被反馈到相位补偿器的输入侧以形成具有一阶特性环路增益的主反馈环路。 抽取滤波器的输出信号被反馈到相位补偿器的输出侧,以形成从相位补偿器的输出侧观察到直到目标频带频率为止的环路增益的次级反馈环路。
    • 57. 发明授权
    • Switching regulator
    • 开关稳压器
    • US07492132B2
    • 2009-02-17
    • US11488833
    • 2006-07-19
    • Hiroshi KuroiwaYasuhiko KokamiOsamu Yamashita
    • Hiroshi KuroiwaYasuhiko KokamiOsamu Yamashita
    • G05F1/00G05F1/613
    • H02M3/156H02M2001/0022
    • The present invention provides a switching regulator having good stability compatible with a good response and an enhanced protection function. A first capacitor is placed between an output end of an inductor to generate an output voltage and a ground potential. From input voltage, a current is supplied to the inductor's input end by a first switch element. A first feedback path includes a hysteretic comparator. An output voltage added to a voltage proportional to the current flowing through the inductor is supplied to the hysteretic comparator which discriminates whether the voltage is appropriate by hysteresis characteristics and generates a PWM control signal in accordance with an output current variation. Moreover, a second feedback path is provided to feed back an error amplifier output voltage with greater gain in a low frequency domain and an attenuation loop around a PWM frequency band to the comparator's reference voltage input terminal. Feedback voltage through the second feedback path is used as a monitoring voltage in a protection circuit.
    • 本发明提供了具有良好稳定性的开关调节器,其具有良好的响应和增强的保护功能。 电感器的输出端之间放置第一电容器以产生输出电压和接地电位。 从输入电压,通过第一开关元件将电流提供给电感器的输入端。 第一反馈路径包括滞后比较器。 加到与流过电感器的电流成比例的电压的输出电压被提供给迟滞比较器,其通过滞后特性来鉴别电压是否合适,并根据输出电流变化产生PWM控制信号。 此外,提供第二反馈路径以将低频域中具有较大增益的误差放大器输出电压和围绕PWM频带的衰减环路反馈到比较器的参考电压输入端子。 通过第二反馈路径的反馈电压被用作保护电路中的监视电压。